I'd say just do your thing man, the music I listen too is metal too. Northlane is a band I'm really digging right now, their lead singer (now left the band) Is quite the spiritual seeker himself too. His songs are about Life, the spiritual path, life's struggles. It's very heavy music but what he talks about resonates deep with me. Just do whatever makes you happy is my suggestion, unless it is destructive to your progress.